10/11 September 1941:real identity of Blenheims

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Hello

10/11 September 1941
In Malta:the Hurricane Years 1940-41,that story(p.292)

During the attack of merchant vessels (between Pantelleria and Lampedusa),three of eight 105° Sqd Blenheims were shot down by three Macchi MC200 and three Fiat CR42 (23° Gruppo CT).
Z7357
Z7423
Z7504

Except that " in History of the Mediterranean Air War" vol.1(p.500),the story is different: SHOT DOWN BY AA and serials differents
Z750 "G" (107 ° Sqd)
Z9603 "F" (107° Sqd)
Z7357 "U" (105° Sqd)

Questions:
1) What is the real identity of the lost Blenheims?
2) Shot down by AA or by 23°Gruppo,(and if yes,who were the Italian's claimants)?

Thanks in advance
michel